After years and years of "wanting" to make the green plumbbob from The Sims series, I finally did it! The cool part about the "costume" is that you can wear whatever you want and still be a Sim! I used Dan's instructable, at this link here, in order to get an idea how I wanted to wire the LEDs.

[Final pic]

I was able to leave the light on for about 6 hours straight without changing the 2 9V batteries. A word of caution, this costume is meant to be worn at night, the light is faint when seen in the daylight, see the 2nd pic what happens when a flash is used. I used 3 LEDs and stuck to the typical 350mA current specified by the manufacturer. Adding more current will simply burn them out faster so don't do that =)

Step 1: Materials

I pretty much bought everything I needed. I was able to find scraps of wire from an old car alarm, but most of the materials below can be substituted. I'll outline my decisions WHY I chose what I chose, because I did experiment with a few different things first. It's a long list but your mileage may vary and you might luck out!

The Light
3-4 High Powered 1 Watt Green LED's - you can't use normal LED's, they simply aren't bright enough. The ones I purchased were: Luxeon Star LXHL-MM1D. Typically rated at 3.42 forward voltage and 350mA. I think their lumen rating is about 25 lm +/- 10%. A different datasheet (for the same product, weird right?) rated them at 50 lm. I don't have a tester, but I'll stick with the lower figure.

3021 BuckPuck - Purchase the one that fits the mA rating of your LEDs to save costs buying resistors. The buckpuck regulates the current to the LEDs, it provides a constant source of current regardless of the size/voltage of your battery pack.
-- You might be able to get away with a PowerPuck, a smaller version of the buckpuck, but the max input voltage is 8v. Only good enough for 2 LEDs...
Both can be found either at: Future Electronics (cheaper prices and more selection/product info, but slow shipping) or The LED Light (prices are slightly higher, but shipping was FAST [2day from NV to CA]).

Resistors - depends on which buckpuck you buy

Wire - to solder the LEDs together, and a longer length to run from the light, down the pole, and into your battery pack. This depends on your height!! I used around 24ga

Optics for LEDs - Usually you'd purchase lens holders and lenses for the LEDs but since I wanted the light to be dispersed and not focused, I just left them naked. The viewing angle of the LEDs is 110°

The Structure
3/16" Wood Dowels - or something lightweight and sturdy and cheap! These were 12" long in packs of 20 at my local craft store. Again, depends on your plans

Hot Glue & Gun - to assemble/hold the sticks together

The Covering
I spent a lot of time on this. I ended up using the white parts of plastic bags and just fused them together. Cloth proved to be too grainy, not waterproof (in case it was a rainy Halloween), and a little heavier.

The Pole
You'll need to find something to "wear" the plumbbob. It needs to be lightweight, and substantially sturdy. I tried using wire hanger, but it was too flimsy to hold the plumbbob at a sufficient height. I used a rod from window blinds (the one that opens/closes the slats)

Step 2: Building the Light

The BuckPuck I bought was 1000mA, the max my LEDs were rated for was 350mA. According to the Datasheet, to bring down the BuckPucks Output Current (IOut), you have to throw a resistor between the Ctrl and Ref pins.

The calculation is: %IOut = R1/50.
If you Solve for R1 at 100% Output, you'll get 5000. This means a 5000 ohm resistor will output 100% current (1000mA). This is crucial to why in the materials section I said to choose the buckpuck closest to the rated mA of your LEDs. If you're going to reuse the buckpuck for a different project down the road, then by all means, buy the 1000mA version and just toss in some resistors.

Connect 2 9v battery holders together in series by stripping and soldering a black wire on one to the red wire on the other. Solder these together and wrap with electrical tape. This gives us 18V. The LED's have a forward voltage of 3.42v each. Total voltage required in the circuit is 10.26v + the 2-3 v required for the buckpuck to operate. 9v batteries are small and compact, and fit perfectly within an Altoids tin.

The red wire from the battery pack should go to the Vin + on the buckpuck, and black wire from the battery holder goes to the Vin -

Solder the resistor (optional) between the REF and CTRL pins

Solder the 3 LED's in series... in short:
Solder a wire from the LED+ pin to the + of one LED. Then solder the - pad on the same led to the + on another star. Repeat. You should have the final LEDs - pad connected to the LED- pin of the buckpuck

Fire up the light!

Step 3: Making the Light Holder

You could just stick the contraption in a structure and call it a day, but you risk several things:
1) heat! these things can get hot! you'll need a heatsink to preserve their long-life characteristics
2) breaking! People get rowdy and things happen, you wouldn't want your hard work/money go to waste right? if a solder pad breaks off, you're kinda screwed (however there are 2 of each polarity on the star)

I found that a large metal binder clip is shaped like a triangle, which is perfect for distributing light in a hexagonal shape! I attached each of the LEDs to one side of the clip and removed the silver metal legs.

I then fed the power wires (from LED + and -) through the holes where the metal legs would normally go. After applying a little bit of thermal paste to each LED, I put GE Silicone on each one to hold them down. Don't use hot glue here, I'm pretty sure it would melt.

If you're having trouble keeping things in place, tape down 2 LEDs with electrical tape while you put silicone on the other one. It takes about 4 hours to cure so be patient!

Step 4: The Structure

The shape of a plumbbob is a hexagonal pyramid. It has six sides and each of the verticies are connected to the center of the hexagon on the Z axis... I decided to make 2 hexagonal pyramids and glue them together, so if I need to easily diagnose any problems down the road, I could just carefully remove the glue to split the structure in half.

Basically, following the PDF below, cut the wood dowels or your choice of material to size.

Each base side of the hexagon is 3.75"
The length from the verticies of the hexagon to the point of the structure is 7"

Place the pieces for the initial hexagon and hot glue the ends together.

I find that the easiest way is to print the PDF actual size on 8.5" x 11" and just use it as a guide.

Put a wooden dowel between the posts at the top of the structure to try to evenly get them spaced together. Hot glue cools really fast so you'll need to be quick, but it also comes off wood and paper really easily, so there's an advantage for you.

This "center" dowel can be any length, but I made is slightly longer than the height from the base to the point. My plan was to put the dowel in the empty space of the light holder, and then to secure it on with the smaller binder clip. I don't have pictures of this, but I'll do so if anyone is confused! It really depends on how you plan on securing the light and the pole to the structure.

When you make the bottom of the structure, in place of the dowel connecting the points together, use something hollow, like the tube of a BIC pen. You'll need the diameter to be big enough for you to 1) slip the LED power wires through and 2) give you a way to secure the structure to the pole, (ie a straightened wire hanger on a stick)

You can clean up the blobs of hot glue with an Xacto knife.

Follow the last picture to get an idea how I secured the light to the structure. Basically the center dowel on the top part of the structure fits inside the triangular hole of the big binder clip. Then the smaller binder clip was clipped to the dowel and hot glued with the silver legs in place. After the smaller clip is hot glued, slide the big clip down so the small clip fits inside of it. It should be snug as long as the metal clips on the small clip are still there!

Feed your power wires down through the hole in the bottom structure

Glue the structure together. Or Don't, you can glue it together later after you've applied the covering material.

Attachments

Step 5: Making the Material

Like I said, I tried cloth, and it looked too grainy, or fibrous for that matter...

I cut the handles off of 2 Target bags, and pretty much tried to leave myself as much of the white opaque plastic as possible. I fused them together by following this etsy post on how to fuse plastic bags. Instead of parchment paper, I just used white printer paper.

Attachments

Step 6: Attach the Pole!

What I did, was tape a piece of wire hanger to the blinds rod I sourced. Then I stuck the hanger inside the hole we left on the bottom of the structure. Since I was going to use electrical tape to wrap the wire going down the pole, I didn't really have to secure the hanger to the structure per se.

In the light, the brightness isn't that great, esp when someone takes a pic with the flash on. This can be attributed to me using the 1000mA buckpuck and then only using 35% of the current to power my 350mA LED's. In the dark however, the costume is utterly AWESOME!

As I said, if anyone needs more pics, I'm willing to take it apart! This community has helped me with several projects and I figure it's about time I contribute back!

9 Comments

I made this but instead of using green LEDs I used green cellophane and used a 70 lumen head lamp glued to the bottom of the diamond, then I put it on the spot setting. To make it glow better I glued green strips of cellophane to the top half, so they were running vertically, that way the light would hit, and reflect/refract whichever you feel like and glow all the way up to the top. It was a success for halloween, except people thought I was the green lantern half the time.

Awesome!! I tried cellophane before too but wasn't satisfied with the glow, but it seems like you worked out the kinks I ran in to. Your costume looks awesome, glad to know I sparked interest! LMAO @ the Green Lantern comments. A lot of my younger cousins didn't know what I was that year either...

It took me awhile to figure it out, I ended up cutting triangles about 3.75-4 inches long with a 7-7.25 inch height and gluing on panes 1 at a time. I triple layered the celophane and it was not looking very god so I stuffed it with tons of celophane and it wasn't working well then I reduced it and then through trial and error found the right amount to hang down.http://imgur.com/a/tsVu8#0

I was in charge of the camera so I didn't take any outside but here is an album in my bathroom. I forgot about lighting it actually, and was going to use a skinny mag light but didn't leave space for it otherwise I would have glued the dowels to it. That is why there is a dead spot on the bottom because I had to shove my head lamp down there and it was too wide to go to the bottom.

Thanks for the idea though, it was a great success for those that knew I was a Sim. If they didn't know the sims I was either green lantern, a black dragon fish(the ones at the bottom of the ocean that attract things with light like in nemo), and I also go link (legend of zelda).

Angler fish! Yeah my tut is kind of shoddy, I know. I took pics of everything, but it's just the explaining that gets me, especially when in the end half of it was thrown together just to make it work. Good job!

No the instructable was great, I only really needed the idea and the pattern print out with the hexagon and proper angles on it was what I really needed since I don't have a protractor and didn't feel like doing it digitally.

My only critique is I didn't see how you got it to sit so high above your head and stay still. I used a long, 3/8" wide wood dowel, a wire hanger, and put shirt on I didn't care about, an had a friend duct tape the hell out of it around entire toros( yeah I couldn't breath well haha). It's the only way I could get it to stay.